ProfilePress ships with a tabbed login, registration and password reset widget that is customizable.

And here is how it will look at the front-end of your website.

Couldn't be more easier than this.

Custom Widgets

If you've gone through the tutorial on building custom login, registration, password reset and edit profile forms, you will agree with me on the fact that ProfilePress makes it very easy to turn those forms into a widget by simply checking a checkbox.